Parison forming apparatus



Sept. 6, 1966 u E. F. WENDLE 3,271,127

PARISON FORMING APPARATUS Filed May 1, 1963 6 Sheets-Sheet 1 INVENTOR.EDWARD F. WENDLE ATTORNEYS Sept. 6, 1966 E. F. WENDLE 3,271,127

PARISON FORMING APPARATUS 7 Filed May 1, 1963 6 Sheets-Sheet 2 FIG. 2

INVENTOR. EDWARD F. WENDLE BYyj (Z ATTORNEYS E. F. WENDLE 5ept. 6, 1966PARISON FORMI G APPARATUS 6 Sheets-Sheet Filed May 1, 1963 FIG 4 FIG. 3

FIG. 5

INVENTOR. EDWARD F. WEN DLE B% Z M 4? yea-Q4 AT O RN EYS Sept. 6, 1966E. F. WEN DLE PARI SON FORMING APPARATUS Filed May 1, 1963 6 Sheets$heetL FIG. 8

m3 3 INVENTOR.

- EDWARD F WEN DLE A TORNEYS Sept. 6, 1966 E. F. WENDLE 3,271,127

PARiSON FORMING APPARATUS Filed May 1, 1963 6 Sheets-Sheet 5 I iINVENTOR.

94 EDWARD E WEN DLE FIG. IO By/hjkzgiii ATTORNEYS E. F. WENDLE Sept. 6,1966 PARI SON FORMING APPARATUS 6 Sheets-Sheet 8 Filed May 1, 1963INVENTOR. EDWARD F. WENDLE BY KZZMM/ ATTORNEYS United States Patent O3,271,127 PARISON FORMING APPARATUS Edward F. Wendie, Godfrey, 11].,assignor to Owens- Illinois, Inc., a corporation of Ohio Filed May 1,1963, Ser. No. 277,164 4 Claims. (Cl. 65-207) The invention relates toglassware forming machines and processes for making bottles known andreferred to as narrow neck ware, and more particularly, the inventionrelates to machine and process improvements for forming a preliminary orparison shape of glass from which narrow neck ware articles are blown toshape.

As used herein, the term narrow neck ware or narrow neck containers isintended to cover containers wherein the internal diameter of the neckis approximately one and one-half inch or less.

In the production of such ware, two well-known types of processes areused. The Owens machine process is typical of the first type. This isoften described as a suction gather-and-blow process. It comprisesplacing an open-ended blank mold in a gathering pool of molten glass andevacuating the mold cavity of air by suction applied therein. A pin,core or short plunger is located in the opposite end of the mold in theneck rings or neck mold. The pin and neck mold together form the bottlefinish on the parison. Evacuation of the mold cavity causes the latterto fill with glass, the glass raising around the neck pin and fillingthe neck mold. The mold is then lifted from the gathering pool and aknife cuts off the glass at the open end of the mold to'forrn aseparated gather or charge of glass in the mold. The blank molds are nowopened to suspend the gather or charge by the neck mold. This gather orcharge is then puffed by air pressure applied at the indentation orbubble formed in the bore of the neck by the neck pin. This distendedbubble is used for blowing the glass when it is next transferred into ablowing mold. The exact details are described in greater detail in thepatent of LaFrance, No. 1,185,687. Y

The second type process is the blow-and-blow process, typicallyillustrated in the Hartford Empire LS. (individual section) machineprocess. It comprises loading a blank mold with a gob of glass severedfrom an orificefed stream in an overhead feeder device. The gob isconveyed by a chute and into the upper end-opening of the blank mold.The opposite end of the blank mold is closed about an adjacent neckmold, the latter being closed at its end by a neck .pin, core orplunger. The neck pin together with the neck mold will define the neckfinish of the bottle on the parison. After the gob is loaded, asettle-blow head closes the open end of the blank mold and air pressureis blown down onto the gob to compact the glass into the underlying neckmold and around the neck pin to form a bored neck including thebeginning of a central bubble or indent. The neck pin is next withdrawnand a baflie closes the top mold opening; whereupon, after a corkagereheat pause, counterblow air pressure is administered into the bubbleformed by the neck pin to puff and distribute or distend the glass inthe blank mold thereby forming a hollow, elongated parison. The detailsof this type machine are described in the patent to Ingle, No.1,911,119.

The present invention presents :a different process for manufacture ofnarrow neck glassware. It involves basically forming the molten glass,whether it be introduced to the mold by suction gather or gob feeding,around .an elongated plunger shaped to define the final bubble or hollowshape in the parison and the glass charge is worked around thisparticular plunger by vacuum to fill the mold and define the parisonshape. No puff or counterblow is needed, and difficulties previously en-3,271,127 Patented Sept. 6, 1966 countered in distribution or settlewave appearance in forming the parison are removed from the process.Likewise, the process may proceed to final blowing sooner, thusenchancing a faster cycle.

In achieving the foregoing objectives, the invention also provides anovel plunger design which furnishes cooling necessary to the processfor handling heat transfer from the glass in forming the parison shape,as mentioned.

Another advantage gained by the process of the invention, just-outlined,is the achievement of some of the benefits alluded to which arederivedfrom a press-and blow type bottle making process in forming wide mouthcontainers, but without entailing the necessity of the extremely highpressing forces necessary for pressing or pushing a pressing plungerinto a charge of glass in a mold. As a suggested technique in productionof narrow neck glassware, US. Patent No. 2,402,234 to Berthold describesa press-and-blow method for forming narrow neck ware by loading a gob ofglass into an open-top blank mold of an 1.8. machine, closing the top ofthe mold with a battle and pressing the gob to a parison by use of anelongated, solid (uncooled) plunger. In the disclosed method, thepressing plunger begins from a lowered position at the lower opening ofthe neck and blank molds and is moved upwardly into the blank moldcavity as the gob is descending therein during loading.

' The pressing of the parison is completed with a top baffle seated,that is, before the pressing plunger is fully inserted in the moldcavity, the baflle is seated on the mold to close the upper openingwhereat the gob was loaded into the mold. In pressing the glass gob to aparison, exceptionally high forces are necessary, e.g., on the order of1200 pounds per square inch, which limits the practical success of themethod and requires an exceptionally heavy machinery unit to operateunder these pressing pressures.

'By way of distinction, the present process obviates the difficultieswith pressing pressures and resultant forces that are encountered in a.press-and-blow process of this type and the invention is found bycomparison to perform satisfactorily and with further unexpectedsuperior benefits.

Another object of the invention, is to enable getting an increasedbubble in the glass charge before the blank mold is opened :and thus thepuff is eliminated so that a more consistent process will result.

A further object of the invention is to provide for chilling of theglass at the inside of the parison and enable setting an enamel in thisarea so that improved shoulder thickness distribution in the bottle willbe obtained. At present in the Owens process, this presents a problem ofweakness to the ware formed. The bottles tend to run thin at theshoulders requiring overloading or beefing up glass distributionunnecessarily throughout the bottle to achieve adequate shoulderthickness.

Another object of the invention is to provide for molding glass loadedto an open-top mold without the necessity of a chilling bafile to closethe mold opening and, therefore, provides for greater ease in reheat ofthe parison, which enables unexpectedly the advantage of a meansobviating the cut-off scar or shear mark of the gob fed to the blankmold, as normally appears in a finally blown bottle.

Other objectives realized in the present invention are a colder blankcavity in operation and a well-centered pattern of the parison formedfrom the glass charge by the techniques of this invention.

The specific nature of this invention, as well as other objects andadvantages thereof, will become apparent to those skilled in the artfrom the following detailed description, taken in conjunction with theannexed sheets of drawings, on which, by way of preferred example only,are illustrated embodiments of this invention.

On the drawings:

FIG. 1 is a sectional elevational view showing the invention adapted toa single cavity mold on the known Owens suction machine;

FIG. 2 is an enlarged sectional view, showing the invention on saidOwens machine;

FIGS. 3-7 are somewhat schematic views showing one form of the method ofthe invention, as performed on the Owens machine embodiment illustratedon FIGS. 1 and 2; and

FIGS. 811 show in sectional elevational views another form of the methodof the invention as performed on the LS. (individual section) machine;wherein, FIG. 8 shows the relationship of the parts of the new blankmold apparatus of the invention as the gob of molten glass is loaded tothe mold; FIG. 9 shows the new blank mold apparatus of the invention informing the parison; FIG. 10 shows the new blank mold apparatus of theinvention as the formed parison is to be transferred to the final blowmolding station; and, FIG. 11 is a sectional elevational view of theconventional blow mold apparatus of an LS. machine, showing the parisonblown to a bottle in the blow mold.

In essence, the process of this invention entails inserting a long,narrow plunger through the neck mold and into the end of the closedblank mold well into the cavity of the latter, loading a charge of glassthrough the other open end of the closed blank mold and onto the longplunger, simultaneously applying vacuum from the neck end of the mold tofill the charge around said long plunger and form an elongated parisonhaving a neck finish and an elongated bubble or pattern that is wellcentered. Cooling fluid is administered inside the long plunger tofacilitate removal of heat from the glass and set up an enamel on thepattern. The long plunger is now withdrawn and the blank molds opened.The parison is then allowed to re heat while it is transferred to theblowing mold where it is presently and in suitable fashion blown out toform the bottle.

On the included drawings, two specific forms of the invention are setforth and illustrated in adaptation to the known Owens machine and theHartford-Empire I.S. machine. However, it should be apparent that theinvention is not limited to these particular machines. Persons skilledin this art will, therefore, readily understand and envision the variousmodifications to universally adapt the invention to other machines.

Referring to the drawings:

On FIG. 1 is shown a novel structure, as one embodiment of theinvention, as applied to a head of the multihead Owens suction glassforming machine. This machine is described in considerable detail in thepatent to LaFrance, US. No. 1,185,687; and, therefore, for sake ofsimplicity of illustration merely the portion of the machine relating tothe improvement of structure of this invention will be described. Themachine head is mounted by castings 10 and 11, shown broken away, whichattach the mold carriage to the dipping frame of the machine (notshown). The dipping frame is capable of raising and lowering and iscarried on the rotating frame of the machine. This carries the blankmold unit, indicated generally at 12, to and from the body of moltenglass M for filling the cavity of the blank mold 12 and withdrawing itwhen filled.

The blank mold unit 12 includes a partible neck mold 13 and a partiblebody blank mold 14, each of these molds having complementary halfsections. The neck mold half sections 13 are supported on pivoted arms(not shown) that are rotatably mounted on bosses 15 and 16 supported onthe pin 17 of the mold carriage 18. The neck molds 13 are held on theouter ends of these arms and carried in a plane below the plane of thedipping head 19 attached to the mold carriage. The neck molds 13 aremanipulated by their arms to close and register on the dipping head 19.The blank molds 14 are held on the outer ends of their arms (not shown)which are pivoted by bosses 20 and 21 on the vertical pin 17, and thesemold sections 14 are carried in a plane below the plane of the neckmolds 13. The body blank mold sections 14 are manipulated by their armsto close and register on the closed neck mold sections 13. These arms inclosing their molds 13 and 14 are operated in normal fashion by cams andmechanism on the Owens type machine.

The casting on the dipping frame provides a support for the plungermechanism of this invention. The elongated, narrow neck plunger 22 ofthis invention is supported for vertical movement through the dippinghead 19 on a cover member 23 which, in the lowered position shown, fitsover and covers the cylindrical chamber 24 defined by the dipping head19. The plunger 22 is of such length that it will extend into theparison forming cavity to a point axially beyond the region of the glassin the parison that will be blown to form the shoulder region of thebottle. On the upper side of cover 23, a plunger rod 25 is detachablyconnected by slide key 26 to the lower end of rack 27 provided withlinear teeth 28. The teeth 28 are in mesh with the arcuate segment ofteeth 29 of gear 30 pivoted at 31 on casting 10. This gear 30 is rockedabout its pivot by a link 32 which is connected at 33 to the gear. Therocking of the gear 30 about its pivot will raise and lower the rack 27,and, in turn, this will raise and lower the cover 23 off of and onto thedipping head chamber 24. Also, this movement will raise and lower theplunger 22 away from and into the blank mold cavity of the blank moldunit 12. On FIGS. 1 and 2, the plunger 22 and cover 23 are shown intheir lowered position ready for filling the closed blank mold 14 withmolten glass from the pool M through the end opening 34 of the blankmold.

As best shown on FIG. 2, the plunger 22 is hollow and of thin walledconstruction and made of suitable plunger material, as known in the art.A tapered (stepped) cooling tube 35 is supported in the interior of thehollow plunger 22 in spaced relationship to the inner wall 36 thereof.The cooling tube is connected at 37 to the underside of cover member 23which has an annular flange 38 forming a cylinder 39 thereat. Inside thecylinder 39 is an adapter 40 fastened to flange 38, such as by threads,and the adapter has a circular seal ring 41 making the chamber fluidtight. The hollow plunger 22 is fastened in the adapter 40 and retainedby the interior boss 42 and the end portion 43 thereon. End portion 43has circular seal rings 44. Plunger 22 is normally extended so that theend portion 43 seats against boss 42 by the spring 45. The cooling tube35 is shaped such that it defines a generally uniformly annular zone 46with the inner surface 36 of the plunger 22. Cooling tube 35 includes anaxial opening (not shown) in the end thereof which is adapted to directa cooling fluid against the tip of the plunger 22. In addition, coolingtube 35 is formed with a plurality of radially extending openings orholes, one of which is shown as 47, at longitudinally spaced pointswhich direct the cooling fluid outwardly against the inner wall 36 ofplunger 22. Cooling fluid, such as in the form of compressed air, issupplied from the machine source connected to the conduit or passage 48in the cover member 23, which in turn is connected to the hollow upperend 49 of plunger cooling tube 35. The cooling fluid is thus supplied tothe interior of tube 35 and forced through the end opening thereof andthe radial openings 47. This spent coolant, as it absorbs heat from theplunger wall 36, is removed from the annular space 46 through thechamber 39 which is provided with an exhaust passage 50.

A vacuum source (not shown) is available also on the machine and isconnected to dipping head 19 by conduit 51. The conduit 51 connects toan annular passage 52 in dipping head 19 and this passage is connectedaxially by vertical passages formed between surfaces 53 and 54 (dottedon FIG. 2). This vertical passage connects with the head-space 55between cover 23 and the top edge of dipping head 19 around theperiphery of cylindrical chamber 24.

The vacuum is next connected to the neck mold 13 and body blank mold 14,as may best be seen on FIG. 2. Along the sides of the forming cavitywalls of the neck mold 113 are axially milled slots or passages 56 whichjoin with slots or passages 57 connected to the cavity of the neck moldnear its lower end. After the plunger 22 is inserted to glass formingposition, as shown, there is a further vacuum connection to the upperend of the neck mold cavity by the clearance space 58. This space is onthe order of three to five thousandths of an inch, which, as thoseskilled in the art will appreciate, will allow application of vacuumtherethrough, but will not permit entry of the glass in this passagearea in forming the neck portion of the parison.

Vacuum is connected into the parison body forming cavity of the blankmold 14 as follows. Grooves 59 extend substantially parallel along thecontour of the parison cavity at the mold face or seam, one mold halfsection 14 being shown in full elevation view on FIG. 2. The mold face61 between the longitudinal groove 59 and the wall surface 60 of theparison cavity in mold 14 is a relieved area. This face 61 as it isplaced opposite a similar face on the other mold half section of mold 14when the latter is closed provides a thin clearance passage on the orderof three to five thousandths of an inch connecting vacuum between eachgroove 59 and the interior cavity space of the closed mold 14. Thegrooves 59 are connected into a recessed space 62 along the top of themold 14, and this in turn is connected to a vertical channel formedbetween the surfaces 63 and 64 (shown in dotted outline on FIG. 2) ofthe neck mold and the dipping head 19. This vertical channel orpassageway connects into the annular passage in the dipping head 19, andthe vacuum conduit connection 51 by which vacuum is supplied from themachine. This vacuum source is turned on and off in the usual fashion bythe machine control mechanism, as may be understood by one skilled inthe art or from reference to the mentioned LaFrance patent.

When a parison is formed, as will be described shortly, in the blank andneck molds 14 and 13 around the lowered plunger 22, the plunger will bepulled, the vacuum released and the blank molds 14 are opened away fromthe formed glass. This opening of the blank molds allows the formedparison that is suspended by the neck molds 13 to be enclosed by theblow molds for forming the final narrow neck ware (bottle). During thisinterval of transfer of the parison between the blank mold and blowmold, the parison will undergo a reheat of the skin or enamel formed onits surface and on its internal pattern or bubble surface. It is alsosometimes suitable to assist the run of the glass, i.e., downwarddistending or stretching of the parison, by introduction of airinteriorly into the hollow parison.

As the rack 27 (FIG. 1) raises the plunger 22 and cover 23, a blow side65 is laterally shiftably mounted on the top of dipping head 19. Thisblow slide 65 is connected to a link 66 pivotally connected on arm 67that is mounted intermediate its ends on casting by pin 68. The upperend of arm 67 carries a rotatable roller 69 that rides in cam groove 70on gear 30. As gear 30 rocks in driving rack 27 upwardly, the cam rocksarm 67 so that the linkage 66 slides blow slide 65 over the top ofchamber 24 which was left uncovered by the withdrawal of plunger 22 andcover 23. Blow slide 65 has a port 75 therein which is connectible to asource of compressed air. The port 75 may be connected to a supply oflow pressure air on the machine which will communicate with the cylinderchamber 24 and the interior of the hollow parison that was formed aroundthe plunger 22 by vacuum. This low pressure air is controlled by the camcontrol of the machine and will assist the run or stretch of the parisonduring transfer. Or, the low pressure air may be left off in blow slide65 so that the run or stretch of the parison during transfer is achievedsolely by gravity forces.

Referring to FIGS. 3-7, the method of operation in forming hollowarticles of glassware by the presently described embodiment of theinvention is as follows: On FIG. 3, the neck mold 13 and blank mold 14are both closed and the plunger is in fully lowered (glass forming)position so that in the course of further rotation of the machine, theunit will pass over a pool of molten glass. The dipping frame will nowbe operated, as in FIG. 4, to lower the dipping head 19 until the bottomof blank mold 14 enters the molten glass surface and the end opening 34thereof is immersed. At this time, the vacuum is applied at line 51which evacuates the neck mold cavity and blank mold cavity in the mannerabove described. The atmospheric pressure on the surface of the glasspool fills the blank and neck mold cavities with molten glass and theparison is completely formed around the extended plunger and the parisonis assured a well centered pattern or bubble. In FIG. 5, the dippingframe is raised to lift the blank mold from the glass, the vacuum beingmaintained and the plunger 22 extended. As this is being done, heat isextracted by the cooled plunger 22 to set up a skin or enamel on thebubble and permit withdrawal of the plunger therefrom without itsticking to the glass. The usual cut-oif mechanism for severing anystring of glass from the lower end of the blank mold consists of arotatable knife 71 and swivel mounting 72 (FIG. 2). The knife 71 rocksacross the bottom of the blank mold as it lifts from the glass, as shownon FIG. 5. Then, as shown in FIG. 6, the plunger 22 is raised out of thedipping head 19 and the vacuum is released. The blank mold 14 is nextopened to leave the formed parison ready for reheat and transfer. It isduring this reheat of the enamel on the ouside of the parison and in thebubble region thereof that the parison may run or stretch in the usualfashion. Next, the sections of a partible blow mold 73 are raised andclosed about a bottom plate 74 and registered on the neck mold 13holding the parison. As the plunger 22 was withdrawn, as in FIG. 6, theblow slide 65 was moved over the dipping head 50. After the parison istransferred to and enclosed by the blow mold 73, 74, the port 75 of theblow slide 65 is connected to a source of blowing air pressure on themachine by the usual cam-operated valves of the machine. This will blowout the parison to the shape of a bottle, as is shown in progress onFIG. 7. Thus, one embodiment of the method has been shown and describedwhereby a parison is formed of glass around an elongated, narrow neckplunger in a blank mold, the glass being formed therein by vaccum ordiiferential in atmospheric pressure created by applying the vacuum.

On FIGS. 811, a second embodiment of the invention is illustrated. Thesedrawings show the invention employed on and adapted to a known I.S.blank mold unit, which will be described only to the extent necessary toexplain this embodiment of the invention. A more complete understandingof the LS, machine and its mode of operation may be had by reference tothe Ingle Patent No. 1,911,119.

On FIGS. 8 and 9, there is shown an inverted blank mold which iscomprised of partible sections 81 and 82 each mounted on a mold arm (notshown) movable toward and away from each other to open and closedmolding positions. As viewed on FIGS. 8 and 9, the mold sections areshown in cross-sectional elevational view taken in a plane normal to themold seam whereat the abutting faces of the mold sections 81 and 82 meetwhen closed. In the closed position, as shown, the mold sections definethe parison forming cavity 83 which includes a top opening formed arounda seating surface 84 and a lower opposite end opening 85. The closedmold sections 81 and 82 fit about an annular dovetail 86 on a partibleneck mold 87. The mold sections 81 and 82 close on the mentioned partingline or seam Where the meeting faces of these sections join in abuttingrelationship. The neck mold is mounted on and carried by the LS. invertarms 110 (shown only on FIG. in a conventional manner. The deck mold 87defines a circular cavity that forms the particular narrow neck finishand corkage rim surface of the neck finish of the bottle to be utimatelyformed and the neck mold cavity conforms to and registers with the lowerend opening 85 of the parison cavity of the blank mold. As seen on FIG.8, the top opening about seating surface 84 receives a gob-guide funnel88 which is mounted on the usual machine carriage mechanism (not shown)for moving the funnel into and out of the position shown on FIG. 8. Aswill be apparent from the description of the invention hereinafter, abaffle, which is usually necessary in an I.S. type blank mold unit, willnot be required in the present invention, because the glass is notcounterblown in the blank mold 80. Hence, the mechanism and process ofthis invention is simplified.

Associated with the underside of the neck mold 87 is the elongated,narrow neck plunger mechanism of this embodiment of the invention. Thismechanism is comprised of the elongated, narrow neck plunger 89 which isa hollow plunger that is cooled and constructed similar to theabove-described construction of the hollow, elongated plunger 22, asshown on FIG. 2. The plunger 89 is axially shiftable through a centralbore of thimble 90 about which the neck rings 87 close in the registeredforming position. As best seen on FIG. 9, the thimble 90 is connected bythe clamp 91 to the outer hollow piston 92 of a fluid-operated cylinderpiston assembly, referred to generally at 93. This assembly 93 includesa cylinder housing 94 supported on the frame of the machine. Thecylinder 94 has an upper cylinder head '95 which retains the clamps 91and provides a reciprocal guide for the thimble 90. Slidable axially inthe cylinder 94 is the hollow piston 92. This piston is actuated by asource of air or fluid under pressure in the conventional manner forreciprocating it axially in manipulating the thimble 90 into and out ofthe molding position. As second piston 96 is coaxially mounted formovement in the hollow piston 92. The plunger 89 has an adapter 97 atone end that is threaded into the piston 96. The piston 96 isreciprocated by an independent fluid pressure connection to the sourcewhich is applied internally of the piston 92 in the usual fashion toobtain independent motion of the plunger 89 into the glass formingposition, as shown. In a similar fashion as was earlier described forthe plunger 82 on FIG. 2, the plunger 89 is a thin-walled, hollowplunger having therein a ported or apertured tube 98 which is connectedby the passage 99 to a source of a cooling medium, such as air underpressure. As the cooling medium is supplied internally of the coolingtube and distributed through the apertures, as before described, thecooling medium removes heat from the internal wall of the plunger 89.The coolant circulates back through the spacing 100 between the innerwall of the plunger and the cooling tube. At the lower end of theplunger adapter 97 is a chamber 101 connected by an outlet passage 102for the exhaust of the spent cooling medium.

In the present invention, a charge or gob of molten glass G (FIG. 8) isloaded to the blank mold cavity 83 by the funnel 88 registered on theupper opening of to provide a passage for air from the molding cavity83, but is such that it will not permit the passage of the glass fromwithin the cavity of the neck mold. This gap 103 connects to anunderlying chamber 104 which is formed by the upright lugs 105 on thethimble 90 engaging the undersurface of the neck mold. The chamber 104is connected with plural passages 106 extending upwardly through theneck mold and terminating at the top surface of the neck mold, as shown.The neck mold 87 is relieved at a radially outwardly point, or, to putit another way, is centrally embossed, such that its fit in theenclosure between two sections of the blank mold provides an annularclearance space 107 which connects with the upwardly directed passages106. A formed passage 108 in the blank mold section 82 is connected intothis clearance space 107. A pipe connection is made at 109 to connectthe passage 108 and a source of vacuum on the machine. This lineconnection at 109 will extend through a valve controlled by the timingdrum of the LS. machine so as to apply the vacuum by connecting thesource thereof and the cavity 83 of the blank mold at the proper time inthe molding cycle. This provides a means for applying a negative orsubatmospheric pressure inside the neck mold cavity and the blank moldcavity at the time the glass is guided into the mold by the funnel 88.This vacuum will form the charge or gob G around the plunger 89 by theatmospheric pressure differential being exerted downwardly on the gob Gat its upper end.

Once the gob of glass is completely distributed in the mold cavity 83,it takes the shape of a final parison P. The bafiling of the upperopening of the mold cavity is eliminated and the parison may now betransferred readily to the blow mold, as follows. Referring now to FIGS.10 and 11, it may be seen that the blank mold sections 82 and 83 areopened, and the fluid motor 93 operated so as to withdraw the thimble 90and plunger 89, as shown on FIG. 10, to a cleared, lower position. Theglass parison P is transferred by the invert arms 110, and during thistime reheat of the parison P will occur. This reheat will soften theenamel formed in the corkage bubble B of the parison, as well as softenthe skin or enamel of the exterior of the parison. Reheat will enablesuitable blowing of the parison in the blow mold. As is shown on FIG.10, the parison P now is supported in inverted position solely by theclosed neck mold 87. An uprighting of the parison P is performed by thetransfer arms 110 which are swung about a horizontal pivot or axis inthe usual fashion to transfer the parison to the blow mold 111. The blowmold is partible mold of known design and includes a bottom plate 112.After the transfer of the parison to the blow molding station, the moldsections of the blow mold close about the bottom plate 112 and about theparison. Thereafter, as is conventional procedure, the neck rings areopened and returned to the parison molding position and a blow head 113is placed over the neck finish of the parison. Air under pressure orblowing air is applied through the center passage 113 of the blow headto blow out the parison to the shape of the bottle, as shown on FIG. 11.

In connection with the foregoing description of the two embodiments ofthe invention, it should be apparent that a faster forming cycle isavailable due to the fact that corkage reheat time is eliminated,settle-blow and counter-blow are eliminated, baffles are no longerneeded, puff operations in forming the bubble in the parison in theblank mold is no longer necessary; and, hence, the glass is quicklyformed to the shape of the parison about the pre-positioned, elongated,narrow neck plunger. The heat transfer from the glass by reason of thecooled plunger occurs rapidly to quickly form the skin or enamel on thebubble region of the parison. An early withdrawal of the plunger willenable an early transfer of the parison in final shape to the blow mold.Along with the early transfer is realized the benefit of a longer timein the blow mold for heat removal from the glass in forming a betterbottle having improved glass distribution. The improved glassdistribution in the bottle is in part related to the unique ability ofthis process to attain well centered patterns (bubbles) in the parisonhaving a controlled, uniformly cooled enamel or skin so that the parisonwill blow out into a more uniformly distributed wall of the finalbottle.

While embodiments of the present invention have been herein specificallydescribed, other embodiments and variations may occur to those skilledin the art after a knowledge of the disclosure herein, and it is desiredto include within the scope of the patent granted hereon all suchembodiments and variations, and more particularly as comprehended by theappended claims.

I claim:

1. A glass parison forming apparatus comprising in combination apartible neck mold defining in closed position a neck finish portion ofa parison, means supporting said neck mold for opening and closingmovement at a parison forming station, a partible blank mold defining inclosed position the body of a parison having a shoulder defining regionfor an article to be formed from said parison and being open at the oneend opposite the neck mold for loading molten glass therein, meanssupporting said blank mold for opening and closing movement with respectto said neck mold at the parison forming station, an elongated, narrowplunger adapted to be inserted axially through said neck mold cavity andextend centrally into the blank mold inwardly beyond said shoulderdefining region of the parison rwhereat the plunger is in a glassmolding position, means connected to said plunger and operable formoving the plunger into and out of said molding position with respect tosaid blank mold cavity, means for loading molten glass into the open endof the blank mold, said means being operated to move said plunger intoits said molding position whereby the plunger is in said moldingposition at the time the glass is loaded into said blank, and meansapplying vacuum into the neck mold and blank mold for filling the cavitydefined by said blank and neck mold with glass around said plunger, thesaid mold cavities, when filled, forming a final narrow neck parisonshape.

2. The apparatus of claim 1, the blank mold being disposed upright withits end opening at the lower end of the blank mold, and the meansconnected to the plunger being disposed above the blank mold andsupporting the plunger for inserting it downwardly into said moldingposition in the blank mold cavity.

3. The apparatus of claim 1, the blank mold being disposed upright withits end opening at the upper end of the blank mold, and the meansconnected to the plunger being disposed below the blank molds andsupporting the plunger for inserting it upwardly into said moldingposition in the blank mold cavity.

4. In a glass bottle molding machine for forming molten glass into ahollow parison having a formed neck and finish thereon and an axialintermediate segment defining the shoulder forming region of a bottleblow-formed therefrom, said machine including a partible neck mold and apartible blank mold, means connected to said partible molds forpositioning them in a parison forming cavity defining relationship,means for supplying molten glass to said forming cavity, the improvementin combination therewith comprising an elongated, narrow hollow plungeradapted to be inserted through the neck mold and into said parisonforming cavity to a molding position, said plunger in its said moldingposition extending inwardly beyond said shoulder forming region in saidparison forming cavity and is tapered axially inwardly terminating in asmoothly truncated nose portion, means connected to said plunger formoving it centrally of the neck mold and axially relative to said neckand blank 'molds toward and away from said molding position, said meansmoving the plunger to place the latter in its molding position at thetime the molten glass is loaded into said forming cavity means forcirculating a coolant through the interior of the hollow plunger forcooling the latter, the plunger wall being relatively thin incross-section and constructed of a metal alloy, and means for applying avacuum into the neck mold and blank mold for filling glass around saidplunger.

References Cited by the Examiner UNITED STATES PATENTS 1,177,613 4/1916Garwood et al. -356 X 2,071,295 2/1937 Bridges 65-2l5 X 2,365,92912/1944 Allen et al. 65-215 2,508,891 5/1950 Rowe 65-356 X DONALL H.SYLVESTER, Primary Examiner.

F. W. MIGA, Assistant Examiner.

1. A GLASS PARISON FORMING APPARATUS COMPRISING IN COMBINATION APARTIBLE NECK MOLD DEFINING IN CLOSED POSITION A NECK FINISH PORTION OFA PARISON, MEANS SUPPORTING SAID NECK MOLD FOR OPENING AND CLOSINGMOVEMENT AT A PARISON FORMING STATION, A PARTIBLE BLANK MOLD DEFINING INCLOSED POSITION THE BODY OF A PARISON HAVING A SHOULDER DEFINING REGIONFOR AN ARTICLE TO BE FORMED FROM SAID PARISON AND BEING OPEN AT THE ONEEND OPPOSITE THE NECK MOLD FOR LOADING MOLTEN GLASS THEREIN, MEANSSUPPORTING SAID BLANK MOLD FOR OPENING AND CLOSING MOVEMENT WITH RESPECTTO SAID NECK MOLD AT THE PARISON FORMING STATION, AN ELONGATED, NARROWPLUNGER ADAPTED TO BE INSERTED AXIALLY THROUGH SAID NECK MOLD CAVITY ANDEXTEND CENTRALLY INTO THE BLANK MOLD INWARDLY BEYOND SAID SHOULDERDEFINING REGION OF THE PARISON WHEREAT THE PLUNGER IS IN A GLASS MOLDINGPOSITION, MEANS CONNECTED TO SAID PLUNGER AND OPERABLE FOR MOVING THEPLUNGER INTO AND OUT OF SAID MOLDING POSITION WITH RESPECT TO SAID BLANKMOLD CAVITY, MEANS FOR LOADING MOLTEN GLASS INTO THE OPEN END OF THEBLANK MOLD, SAID MEANS BEING OPERATED TO MOVE SAID PLUNGER INTO ITS SAIDMOLDING POSITION WHEREBY THE PLUNGER IS IN SAID MOLDNG POSITION AT THETIME THE GLASS IS LOADED INTO SAID BLANK AND MEANS APPLYING VACUUM INTOTHE NECK MOLD AND BLANK FOR FILLING THE CAVITY DEFINED BY SAID BLANK ANDNECK MOLD WITH GLASS AROUND SAID PLUNGER, THE SAID MOLD CAVITIES, WHENFILLED, FORMING A FINAL NARROW NECK PARISON SHAPE.